Calculate the number of atoms in a 3.40 g of potassium Calculate the mass of 3.5

Question

Calculate the number of atoms in a 3.40 g of potassium Calculate the mass of 3.543 x 10^23 atoms of magnesium Calculate the mass of 0.105 mol of copper Calculate the number of moles of calcium in a 5.75 g sample of the metal. Give the systematic names for each of the following compounds: Ba(No_1)_2 NiSO_4 P_2O_s A(OH)_3 Give the formula for each of the following compounds: potassium nitrate vanadium (v) oxide ammonium sulfide sodium iodate sodium hydrogen carbonate Give the formula and name of the compound formed between the following ions:

Explanation / Answer

1. Molecular weight of Potassium is 39 g/mol so:

moles = 3.40 / 39 = 0.087 moles

atoms = 0.087 moles * 6.02x1023 atom/moles = 5.25x1022 atoms

2. molecular weight of magnesium is 24 g/mol so:

moles = 3.543x1023 / 6.02x1023 = 0.5885 moles

mass = 0.5885 * 24 = 14.12 g

3. molecular weight of copper is 63.55 g/mol

mass = 0.105 * 63.55 = 6.66728 g

4. molecular weight of Calcium is 40 g/mol

moles = 5.75 / 40 = 0.1438 moles

Post question 5, 6 and 7 in another question thread.

Hope this helps

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